Blind Estimation of OFDM Sub-carrier Frequencies Based on the High-Order Cyclic Cumulants
基于高阶循环累积量的OFDM子载波盲估计

Aiming at the real application of the communication countermeasures and OFDM signal demodulation, a method is proposed to estimate the sub-carriers of OFDM signal using the high-order cyclic cumulants. Due to the fact that the high-order cyclic cumulants can suppress the stationary and non-stationary Gaussian noise, it is proved by theoretical analysis under the above noise background that the specific four-order cyclic cumulants of the OFDM signal with the 2/4 PSK modulation exist only at the location of its sub-carriers, so that the sub-carrier estimation can be implemented by detecting the cyclo-frequencies, The proposed method can also be popularized on the OFDM signal with star-QAM and high-order PSK modulation. And simulation proves the effectiveness of the proposed method.